Figure 4 - uploaded by Bruce W Hayward
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Ostracoda from Matai Bay not previously illustrated from the Hauraki Gulf (Morley and Hayward 2012). Ponticocythereis aff. decora, stn. M6, 5 m depth, MA120561; Ponticocythereis aff. militaris, stn. M7, 2 m depth, MA120566; Propontocypris sp. 2, stn. M1, 26 m depth, MA120552; Quadracythere biruga, stn. M7, 2 m depth, MA120562; Quadracythere truncula, stn. M10, 1 m depth, MA120564; Quadracythere sp. 1, stn. M5, 18 m depth, MA120563; Semicytherura costellata, stn. M1, 26 m depth, MA120565; Xestoleberis sp. 9, stn. M13, 6 m depth, MA120567; Xestoleberis sp. 11, stn. M5, 18 m depth, MA120568; Xestoleberis sp. 12, stn. M6, 5 m depth, MA120569. Scale bars are 0.1 mm long.
Source publication
Seventy-five species of benthic marine ostracods, 120 species of benthic foraminifera and 113
species of marine molluscs (96 gastropods, 21 bivalves) are recorded from 16 dredge stations
(0-45 m water depth) in Matai Bay, Northland, New Zealand. The molluscs comprise 86 species of
micromolluscs (76 gastropods, 10 bivalves) and 27 juvenile specimens...
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Citations
... It was decided that more robust and meaningful results would be obtained if our Cavalli ostracod census count data (15 samples) were combined with census data previously obtained by the same methodology from Matai Bay (16 samples; Morley and Hayward 2014) and the Hauraki Gulf (82 samples, Morley and Hayward 2012). Raw census counts were standardised by converting counts to proportions of sample totals (= relative abundances). ...
One hundred and twelve species of marine ostracod are recorded from 0-29 m depth around the
Cavalli Islands, northeast Northland – the most diverse ostracod fauna from a relatively small
area (10 km2) documented so far from New Zealand. Thirty of these species are additions to the
known Recent (living) ostracod fauna of this country, although only ten have been identified to
named species – the Recent Australian species Callistocythere dorsotuberculata paucicostata,
Callistocythere keiji, Callistocythere ventroalata, Lankacythere coralloides, Neohornibrookella
lactea, Papillatabairdia elongata, Tasmanocypris dietmarkeyseri, Xestoleberis posidonicola,
Yassinicythere bassiounii and the fossil (early Miocene) New Zealand species Hemicythere
tarakohensis. This brings the total marine ostracod fauna in the New Zealand EEZ to 496 species,
of which 229 (46%) are recorded from shelf depths (0-200 m) in the Aupourian Province, east of
northern New Zealand.
Cluster analysis of 113 quantitative ostracod samples from inner-mid shelf depths east of
Northland and Auckland resulted in the recognition of 14 subassociations in 4 associations. The
majority of the Cavalli faunas cluster together in three subassociations with the most diverse faunas
and lowest species dominance, characterised by common Loxoconcha punctata. Subdominant
in the shallowest subassociation is Xestoleberis olivacea, whereas Neonesidea amygdaloides,
Quadracythere biruga and Ambostracon pumilum are subdominant in the other two subassociations
in coarser sediment in the current-swept Cavalli Passage. One distinctly different unclustered
Cavalli Islands ostracod fauna occurs in strong current-swept, shell gravel between rocky islets
at 9 m depth and is strongly dominated (48%) by Xestoleberis chilensis austrocontinentalis with
subdominant Polycope sp. and Parapolycope cf. loscobanosi.
Distinctive low diversity foraminiferal and ostracod faunas in Holocene mud from a stratigraphic drillhole through Rangitoto Volcano (∼600 years old) indicate a highly sheltered, shallow-marine environment existed near the middle of the exposed entrance to Waitemata Harbour, Auckland, for at least 7000 years prior to Rangitoto’s eruption. Modern Analogue Technique estimates for these faunas indicate they accumulated at low tidal to shallow subtidal depths (0–11 m). The most similar analogue faunas lived subtidally in the extreme shelter inside the breached Onepoto maar lagoon, Auckland. Therefore, we infer the possible existence of a pre-7500 year-old maar crater and surrounding tuff ring buried beneath Rangitoto Volcano. This Holocene mud occurs in the drillhole 24–10 m lower than where the microfaunas indicate it accumulated. It is inferred to have slid into the adjacent harbour channel, along with 7 m of basaltic tuff and a piece of lava flow, near the start of the second phase of Rangitoto’s eruption.
The shallow water benthic foraminiferal and ostracod assemblages of the Gulf of Pozzuoli, located in the central Tyrrhenian Sea, were studied to investigate the relationship between calcareous meiofaunas and contaminant concentrations in bottom sediments exposed to prolonged industrial pollution. Both benthic foraminifers and ostracods displayed high-diversity and low-dominance, unusual features in highly contaminated environments. High-diversity values were possibly linked to the oligotrophic, well-oxygenated, and CaCO 3 -supersaturated coastal Mediterranean waters. The comparison with historical data suggested that assemblage composition changed in the last decades, with an increase in the relative abundance of benthic foraminiferal ( Quinqueloculina seminulum, Bulimina elongata ) and ostracod ( Xestoleberis , Loxoconcha, Semicytherura rarecostata ) taxa. They probably represent organisms tolerant to the environmental variations in the last decades. The relationships between granulometry and diversity indices, high correlation values between Quinqueloculina lata and heavy metal pollution, and the preference of the ostracod genera Urocythereis and Paracytheridea for very shallow marine waters were highlighted.
